+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright 2007, Google Inc.
- * Copyright 2012, Intel Inc.
- *
- * based on omap.c driver, which was
- * Copyright (C) 2004 Nokia Corporation
- * Written by Tuukka Tikkanen and Juha Yrjölä <juha.yrjola@nokia.com>
- * Misc hacks here and there by Tony Lindgren <tony@atomide.com>
- * Other hacks (DMA, SD, etc) by David Brownell
- */
-
-#include <linux/module.h>
-#include <linux/platform_device.h>
-#include <linux/major.h>
-
-#include <linux/types.h>
-#include <linux/pci.h>
-#include <linux/interrupt.h>
-
-#include <linux/kernel.h>
-#include <linux/fs.h>
-#include <linux/errno.h>
-#include <linux/hdreg.h>
-#include <linux/kdev_t.h>
-#include <linux/blkdev.h>
-#include <linux/mutex.h>
-#include <linux/scatterlist.h>
-#include <linux/mmc/mmc.h>
-#include <linux/mmc/host.h>
-#include <linux/mmc/card.h>
-
-#include <linux/moduleparam.h>
-#include <linux/init.h>
-#include <linux/ioport.h>
-#include <linux/dma-mapping.h>
-#include <linux/delay.h>
-#include <linux/spinlock.h>
-#include <linux/timer.h>
-#include <linux/clk.h>
-
-#include <asm/io.h>
-#include <asm/irq.h>
-
-#include <asm/types.h>
-#include <linux/uaccess.h>
-
-#define DRIVER_NAME "goldfish_mmc"
-
-#define BUFFER_SIZE 16384
-
-#define GOLDFISH_MMC_READ(host, addr) (readl(host->reg_base + addr))
-#define GOLDFISH_MMC_WRITE(host, addr, x) (writel(x, host->reg_base + addr))
-
-enum {
- /* status register */
- MMC_INT_STATUS = 0x00,
- /* set this to enable IRQ */
- MMC_INT_ENABLE = 0x04,
- /* set this to specify buffer address */
- MMC_SET_BUFFER = 0x08,
-
- /* MMC command number */
- MMC_CMD = 0x0C,
-
- /* MMC argument */
- MMC_ARG = 0x10,
-
- /* MMC response (or R2 bits 0 - 31) */
- MMC_RESP_0 = 0x14,
-
- /* MMC R2 response bits 32 - 63 */
- MMC_RESP_1 = 0x18,
-
- /* MMC R2 response bits 64 - 95 */
- MMC_RESP_2 = 0x1C,
-
- /* MMC R2 response bits 96 - 127 */
- MMC_RESP_3 = 0x20,
-
- MMC_BLOCK_LENGTH = 0x24,
- MMC_BLOCK_COUNT = 0x28,
-
- /* MMC state flags */
- MMC_STATE = 0x2C,
-
- /* MMC_INT_STATUS bits */
-
- MMC_STAT_END_OF_CMD = 1U << 0,
- MMC_STAT_END_OF_DATA = 1U << 1,
- MMC_STAT_STATE_CHANGE = 1U << 2,
- MMC_STAT_CMD_TIMEOUT = 1U << 3,
-
- /* MMC_STATE bits */
- MMC_STATE_INSERTED = 1U << 0,
- MMC_STATE_READ_ONLY = 1U << 1,
-};
-
-/*
- * Command types
- */
-#define OMAP_MMC_CMDTYPE_BC 0
-#define OMAP_MMC_CMDTYPE_BCR 1
-#define OMAP_MMC_CMDTYPE_AC 2
-#define OMAP_MMC_CMDTYPE_ADTC 3
-
-
-struct goldfish_mmc_host {
- struct mmc_request *mrq;
- struct mmc_command *cmd;
- struct mmc_data *data;
- struct device *dev;
- unsigned char id; /* 16xx chips have 2 MMC blocks */
- void *virt_base;
- unsigned int phys_base;
- int irq;
- unsigned char bus_mode;
- unsigned char hw_bus_mode;
-
- unsigned int sg_len;
- unsigned dma_done:1;
- unsigned dma_in_use:1;
-
- void __iomem *reg_base;
-};
-
-static inline int
-goldfish_mmc_cover_is_open(struct goldfish_mmc_host *host)
-{
- return 0;
-}
-
-static ssize_t
-goldfish_mmc_show_cover_switch(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct goldfish_mmc_host *host = dev_get_drvdata(dev);
-
- return sprintf(buf, "%s\n", goldfish_mmc_cover_is_open(host) ? "open" :
- "closed");
-}
-
-static DEVICE_ATTR(cover_switch, S_IRUGO, goldfish_mmc_show_cover_switch, NULL);
-
-static void
-goldfish_mmc_start_command(struct goldfish_mmc_host *host, struct mmc_command *cmd)
-{
- u32 cmdreg;
- u32 resptype;
- u32 cmdtype;
-
- host->cmd = cmd;
-
- resptype = 0;
- cmdtype = 0;
-
- /* Our hardware needs to know exact type */
- switch (mmc_resp_type(cmd)) {
- case MMC_RSP_NONE:
- break;
- case MMC_RSP_R1:
- case MMC_RSP_R1B:
- /* resp 1, 1b, 6, 7 */
- resptype = 1;
- break;
- case MMC_RSP_R2:
- resptype = 2;
- break;
- case MMC_RSP_R3:
- resptype = 3;
- break;
- default:
- dev_err(mmc_dev(mmc_from_priv(host)),
- "Invalid response type: %04x\n", mmc_resp_type(cmd));
- break;
- }
-
- if (mmc_cmd_type(cmd) == MMC_CMD_ADTC)
- cmdtype = OMAP_MMC_CMDTYPE_ADTC;
- else if (mmc_cmd_type(cmd) == MMC_CMD_BC)
- cmdtype = OMAP_MMC_CMDTYPE_BC;
- else if (mmc_cmd_type(cmd) == MMC_CMD_BCR)
- cmdtype = OMAP_MMC_CMDTYPE_BCR;
- else
- cmdtype = OMAP_MMC_CMDTYPE_AC;
-
- cmdreg = cmd->opcode | (resptype << 8) | (cmdtype << 12);
-
- if (host->bus_mode == MMC_BUSMODE_OPENDRAIN)
- cmdreg |= 1 << 6;
-
- if (cmd->flags & MMC_RSP_BUSY)
- cmdreg |= 1 << 11;
-
- if (host->data && !(host->data->flags & MMC_DATA_WRITE))
- cmdreg |= 1 << 15;
-
- GOLDFISH_MMC_WRITE(host, MMC_ARG, cmd->arg);
- GOLDFISH_MMC_WRITE(host, MMC_CMD, cmdreg);
-}
-
-static void goldfish_mmc_xfer_done(struct goldfish_mmc_host *host,
- struct mmc_data *data)
-{
- if (host->dma_in_use) {
- enum dma_data_direction dma_data_dir;
-
- dma_data_dir = mmc_get_dma_dir(data);
-
- if (dma_data_dir == DMA_FROM_DEVICE) {
- /*
- * We don't really have DMA, so we need
- * to copy from our platform driver buffer
- */
- sg_copy_from_buffer(data->sg, 1, host->virt_base,
- data->sg->length);
- }
- host->data->bytes_xfered += data->sg->length;
- dma_unmap_sg(mmc_dev(mmc_from_priv(host)), data->sg,
- host->sg_len, dma_data_dir);
- }
-
- host->data = NULL;
- host->sg_len = 0;
-
- /*
- * NOTE: MMC layer will sometimes poll-wait CMD13 next, issuing
- * dozens of requests until the card finishes writing data.
- * It'd be cheaper to just wait till an EOFB interrupt arrives...
- */
-
- if (!data->stop) {
- host->mrq = NULL;
- mmc_request_done(mmc_from_priv(host), data->mrq);
- return;
- }
-
- goldfish_mmc_start_command(host, data->stop);
-}
-
-static void goldfish_mmc_end_of_data(struct goldfish_mmc_host *host,
- struct mmc_data *data)
-{
- if (!host->dma_in_use) {
- goldfish_mmc_xfer_done(host, data);
- return;
- }
- if (host->dma_done)
- goldfish_mmc_xfer_done(host, data);
-}
-
-static void goldfish_mmc_cmd_done(struct goldfish_mmc_host *host,
- struct mmc_command *cmd)
-{
- host->cmd = NULL;
- if (cmd->flags & MMC_RSP_PRESENT) {
- if (cmd->flags & MMC_RSP_136) {
- /* response type 2 */
- cmd->resp[3] =
- GOLDFISH_MMC_READ(host, MMC_RESP_0);
- cmd->resp[2] =
- GOLDFISH_MMC_READ(host, MMC_RESP_1);
- cmd->resp[1] =
- GOLDFISH_MMC_READ(host, MMC_RESP_2);
- cmd->resp[0] =
- GOLDFISH_MMC_READ(host, MMC_RESP_3);
- } else {
- /* response types 1, 1b, 3, 4, 5, 6 */
- cmd->resp[0] =
- GOLDFISH_MMC_READ(host, MMC_RESP_0);
- }
- }
-
- if (host->data == NULL || cmd->error) {
- host->mrq = NULL;
- mmc_request_done(mmc_from_priv(host), cmd->mrq);
- }
-}
-
-static irqreturn_t goldfish_mmc_irq(int irq, void *dev_id)
-{
- struct goldfish_mmc_host *host = (struct goldfish_mmc_host *)dev_id;
- u16 status;
- int end_command = 0;
- int end_transfer = 0;
- int state_changed = 0;
- int cmd_timeout = 0;
-
- while ((status = GOLDFISH_MMC_READ(host, MMC_INT_STATUS)) != 0) {
- GOLDFISH_MMC_WRITE(host, MMC_INT_STATUS, status);
-
- if (status & MMC_STAT_END_OF_CMD)
- end_command = 1;
-
- if (status & MMC_STAT_END_OF_DATA)
- end_transfer = 1;
-
- if (status & MMC_STAT_STATE_CHANGE)
- state_changed = 1;
-
- if (status & MMC_STAT_CMD_TIMEOUT) {
- end_command = 0;
- cmd_timeout = 1;
- }
- }
-
- if (cmd_timeout) {
- struct mmc_request *mrq = host->mrq;
- mrq->cmd->error = -ETIMEDOUT;
- host->mrq = NULL;
- mmc_request_done(mmc_from_priv(host), mrq);
- }
-
- if (end_command)
- goldfish_mmc_cmd_done(host, host->cmd);
-
- if (end_transfer) {
- host->dma_done = 1;
- goldfish_mmc_end_of_data(host, host->data);
- } else if (host->data != NULL) {
- /*
- * WORKAROUND -- after porting this driver from 2.6 to 3.4,
- * during device initialization, cases where host->data is
- * non-null but end_transfer is false would occur. Doing
- * nothing in such cases results in no further interrupts,
- * and initialization failure.
- * TODO -- find the real cause.
- */
- host->dma_done = 1;
- goldfish_mmc_end_of_data(host, host->data);
- }
-
- if (state_changed) {
- u32 state = GOLDFISH_MMC_READ(host, MMC_STATE);
- pr_info("%s: Card detect now %d\n", __func__,
- (state & MMC_STATE_INSERTED));
- mmc_detect_change(mmc_from_priv(host), 0);
- }
-
- if (!end_command && !end_transfer && !state_changed && !cmd_timeout) {
- status = GOLDFISH_MMC_READ(host, MMC_INT_STATUS);
- dev_info(mmc_dev(mmc_from_priv(host)), "spurious irq 0x%04x\n",
- status);
- if (status != 0) {
- GOLDFISH_MMC_WRITE(host, MMC_INT_STATUS, status);
- GOLDFISH_MMC_WRITE(host, MMC_INT_ENABLE, 0);
- }
- }
-
- return IRQ_HANDLED;
-}
-
-static void goldfish_mmc_prepare_data(struct goldfish_mmc_host *host,
- struct mmc_request *req)
-{
- struct mmc_data *data = req->data;
- int block_size;
- unsigned sg_len;
- enum dma_data_direction dma_data_dir;
-
- host->data = data;
- if (data == NULL) {
- GOLDFISH_MMC_WRITE(host, MMC_BLOCK_LENGTH, 0);
- GOLDFISH_MMC_WRITE(host, MMC_BLOCK_COUNT, 0);
- host->dma_in_use = 0;
- return;
- }
-
- block_size = data->blksz;
-
- GOLDFISH_MMC_WRITE(host, MMC_BLOCK_COUNT, data->blocks - 1);
- GOLDFISH_MMC_WRITE(host, MMC_BLOCK_LENGTH, block_size - 1);
-
- /*
- * Cope with calling layer confusion; it issues "single
- * block" writes using multi-block scatterlists.
- */
- sg_len = (data->blocks == 1) ? 1 : data->sg_len;
-
- dma_data_dir = mmc_get_dma_dir(data);
-
- host->sg_len = dma_map_sg(mmc_dev(mmc_from_priv(host)), data->sg,
- sg_len, dma_data_dir);
- host->dma_done = 0;
- host->dma_in_use = 1;
-
- if (dma_data_dir == DMA_TO_DEVICE) {
- /*
- * We don't really have DMA, so we need to copy to our
- * platform driver buffer
- */
- sg_copy_to_buffer(data->sg, 1, host->virt_base,
- data->sg->length);
- }
-}
-
-static void goldfish_mmc_request(struct mmc_host *mmc, struct mmc_request *req)
-{
- struct goldfish_mmc_host *host = mmc_priv(mmc);
-
- WARN_ON(host->mrq != NULL);
-
- host->mrq = req;
- goldfish_mmc_prepare_data(host, req);
- goldfish_mmc_start_command(host, req->cmd);
-}
-
-static void goldfish_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
-{
- struct goldfish_mmc_host *host = mmc_priv(mmc);
-
- host->bus_mode = ios->bus_mode;
- host->hw_bus_mode = host->bus_mode;
-}
-
-static int goldfish_mmc_get_ro(struct mmc_host *mmc)
-{
- uint32_t state;
- struct goldfish_mmc_host *host = mmc_priv(mmc);
-
- state = GOLDFISH_MMC_READ(host, MMC_STATE);
- return ((state & MMC_STATE_READ_ONLY) != 0);
-}
-
-static const struct mmc_host_ops goldfish_mmc_ops = {
- .request = goldfish_mmc_request,
- .set_ios = goldfish_mmc_set_ios,
- .get_ro = goldfish_mmc_get_ro,
-};
-
-static int goldfish_mmc_probe(struct platform_device *pdev)
-{
- struct mmc_host *mmc;
- struct goldfish_mmc_host *host = NULL;
- struct resource *res;
- int ret = 0;
- int irq;
- dma_addr_t buf_addr;
-
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- irq = platform_get_irq(pdev, 0);
- if (res == NULL || irq < 0)
- return -ENXIO;
-
- mmc = mmc_alloc_host(sizeof(struct goldfish_mmc_host), &pdev->dev);
- if (mmc == NULL) {
- ret = -ENOMEM;
- goto err_alloc_host_failed;
- }
-
- host = mmc_priv(mmc);
-
- pr_err("mmc: Mapping %lX to %lX\n", (long)res->start, (long)res->end);
- host->reg_base = ioremap(res->start, resource_size(res));
- if (host->reg_base == NULL) {
- ret = -ENOMEM;
- goto ioremap_failed;
- }
- host->virt_base = dma_alloc_coherent(&pdev->dev, BUFFER_SIZE,
- &buf_addr, GFP_KERNEL);
-
- if (host->virt_base == 0) {
- ret = -ENOMEM;
- goto dma_alloc_failed;
- }
- host->phys_base = buf_addr;
-
- host->id = pdev->id;
- host->irq = irq;
-
- mmc->ops = &goldfish_mmc_ops;
- mmc->f_min = 400000;
- mmc->f_max = 24000000;
- mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
- mmc->caps = MMC_CAP_4_BIT_DATA;
- mmc->caps2 = MMC_CAP2_NO_SDIO;
-
- /* Use scatterlist DMA to reduce per-transfer costs.
- * NOTE max_seg_size assumption that small blocks aren't
- * normally used (except e.g. for reading SD registers).
- */
- mmc->max_segs = 32;
- mmc->max_blk_size = 2048; /* MMC_BLOCK_LENGTH is 11 bits (+1) */
- mmc->max_blk_count = 2048; /* MMC_BLOCK_COUNT is 11 bits (+1) */
- mmc->max_req_size = BUFFER_SIZE;
- mmc->max_seg_size = mmc->max_req_size;
-
- ret = request_irq(host->irq, goldfish_mmc_irq, 0, DRIVER_NAME, host);
- if (ret) {
- dev_err(&pdev->dev, "Failed IRQ Adding goldfish MMC\n");
- goto err_request_irq_failed;
- }
-
- host->dev = &pdev->dev;
- platform_set_drvdata(pdev, host);
-
- ret = device_create_file(&pdev->dev, &dev_attr_cover_switch);
- if (ret)
- dev_warn(mmc_dev(mmc), "Unable to create sysfs attributes\n");
-
- GOLDFISH_MMC_WRITE(host, MMC_SET_BUFFER, host->phys_base);
- GOLDFISH_MMC_WRITE(host, MMC_INT_ENABLE,
- MMC_STAT_END_OF_CMD | MMC_STAT_END_OF_DATA |
- MMC_STAT_STATE_CHANGE | MMC_STAT_CMD_TIMEOUT);
-
- mmc_add_host(mmc);
- return 0;
-
-err_request_irq_failed:
- dma_free_coherent(&pdev->dev, BUFFER_SIZE, host->virt_base,
- host->phys_base);
-dma_alloc_failed:
- iounmap(host->reg_base);
-ioremap_failed:
- mmc_free_host(mmc);
-err_alloc_host_failed:
- return ret;
-}
-
-static int goldfish_mmc_remove(struct platform_device *pdev)
-{
- struct goldfish_mmc_host *host = platform_get_drvdata(pdev);
- struct mmc_host *mmc = mmc_from_priv(host);
-
- BUG_ON(host == NULL);
-
- mmc_remove_host(mmc);
- free_irq(host->irq, host);
- dma_free_coherent(&pdev->dev, BUFFER_SIZE, host->virt_base, host->phys_base);
- iounmap(host->reg_base);
- mmc_free_host(mmc);
- return 0;
-}
-
-static struct platform_driver goldfish_mmc_driver = {
- .probe = goldfish_mmc_probe,
- .remove = goldfish_mmc_remove,
- .driver = {
- .name = DRIVER_NAME,
- .probe_type = PROBE_PREFER_ASYNCHRONOUS,
- },
-};
-
-module_platform_driver(goldfish_mmc_driver);
-MODULE_LICENSE("GPL v2");
projects / platform / kernel / linux-starfive.git / commitdiff